DESCRIPTION

ETA4056 is a single cell, fully integrated constant current

(CC)/constant voltage (CV) Li-ion battery charger. Its

compact package with minimum external components

requirement makes the ETA4056 ideal for portable

applications. No external sense resistor or blocking diode is

necessary for the ETA4056. Build-in thermal feedback

mechanism regulates the charge current to control the die

temperature during high power operation or at elevated

ambient temperature. The ETA4056 has a pre-charge

function for trickle charging deeply discharged batteries.

The fast charge current can be programmed by an external

resistor. CV regulation mode is automatically enabled once

the battery’s charging curve reaches the constant voltage

portion. The output current then decays and is finally

terminated once the charge current drops to 1/10th of the

programmed value. The ETA4056 keeps monitoring the

battery voltage and enables a new charge cycle once the

voltage drops by 120mV below the CV value.

ETA4056 is in an ESOP8, DFN2x2-8, DFN2x3-8, and

SOT23-6 package.

FEATURES

 16V input standoff voltage

 4.2V charge termination voltage

 2.9V trickle charge threshold

 Charge current programmable, up to 1.2A

 250nA BAT current when no charging

 Soft-start limits in-rush current

 ESOP8 / DFN2x2-8 / DFN2x3-8 / SOT23-6

APPLICATIONS

 E-cigarette

 Toys

 Bluetooth applications

 Li-ion battery powered devices